“To what extent are staff development program participants actually using what they are learning in the (fill in the blank) initiative in their daily work?” The question about actual use in the workplace is key to tracking impact and designing help during change. Whether the staff learning initiative is differentiating instruction, assessing student performance, teaching critical thinking, mapping curricula, integrating technology into instruction, learning a particular teaming approach, or some other complex bundle, getting participants to use what they learn is a major milestone. Finding credible yet efficient techniques to gauge the extent of implementation can be frustrating. The Levels of Use framework (known as the LoU) is a powerful researchbased approach for gathering diagnostic data on individuals involved in incorporating a new approach into